How thin is a single optical fiber cable
Because the effect of dispersion increases with the length of the fiber, a fiber transmission system is often characterized by its bandwidth–distance product, usually expressed in units of ·km. This value is a product of bandwidth and distance because there is a trade-off between the bandwidth of the signal and the distance over which it can be carried. Single-mode fiber features a thin 8-9µm core that carries a single optical signal. Core size determines performance: Single-mode (9 μm) is ideal for long distances; multimode (50 μm or 62. Unlike copper cables that use electrical signals, fiber optics use light, which allows: Each fiber strand is extremely thin—almost like a human hair—but multiple fibers are.
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